[cairo] using expat for libsvg

[Phil Blundell]

Here's a first draft of a patch to allow libsvg to be built against
libexpat rather than libxml2.  This is handy for those of us working
with small systems, since libxml2's binaries are several times larger
than those of expat.

Some functionality is still missing: most notably, the hash table
functions in svg_parser_expat.c need to be implemented to make element
lookups work.  But it seems to work well enough to render simple SVGs.

p.

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